.wrap{
    padding: 50px;
    color: greenyellow;
    position: relative;
    background-color: lightseagreen;
    .triangle{
        background-color: lightslategray;
        text-align: center;
        height: 40px;
        line-height: 40px;
        &:after{
            position: absolute;
            content: '';
            left: 48%;
            top: 157px;
            border-top: 9px solid lightslategray;
            border-right: 12px solid transparent;
            border-left: 12px solid transparent;
            // border-bottom: 9px solid blue;
        }
    }
}